Injection Molding Principles and Practical Analysis of Multi-Color Cup Component Production (Plastic Materials Part 2)

There are stories in cups, and warmth in life. Hello everyone, "Dong Dong's Cup Talk" is here.

In our previous discussions, we mentioned that our factory not only manufactures cups but also specializes in plastic mold production. Since plastic components are essential in cup manufacturing, our facility is equipped with a professional and well-established injection molding department. http://www.umbottle.com/ProductsDetail-VB-10332.htmlToday, based on years of hands-on experience and real-world cases, I'll continue sharing practical insights into injection molding principles and multi-color cup component production. Given the depth of content, this will be presented in multiple installments.

II. Characteristics and Key Injection Molding Considerations for Six Food-Grade Plastic Materials

3. Tritan (Copolyester)

Characteristics:

- BPA Free

- Heat resistant up to 100°C

- Better impact resistance than PC, http://www.umbottle.com/ProductsDetail-VB-10332.htmlbut lower hardness

Applications:

- Baby bottles and sports water bottles

Process Challenges:

- Dense cooling channel layout required http://www.umbottle.com/ProductsDetail-VB-10332.html(Tritan solidifies quickly, prone to flow marks)

- Injection speed should be reduced by 30% to minimize internal stress

Success Case:

A brand achieved seamless integration of high-clarity bottles and pattern-free designs using Tritan + http://www.umbottle.com/ProductsDetail-VB-10332.htmlIn-Mold Labeling (IML) technology.

4. ABS (Acrylonitrile Butadiene Styrene)

Characteristics:

- Excellent surface glosshttp://www.umbottle.com/ProductsDetail-VB-10332.html

- Suitable for plating/spraying

- Heat resistance limited to 80°C

Applications:

- Decorative cup lids

- Buttons (non-hot water contact parts)

Process Pitfalls:

- High shear may cause rubber phase separationhttp://www.umbottle.com/ProductsDetail-VB-10332.html (reduce screw rotation speed)

- Mirror polishing required for mold surfaces (to prevent visible weld lines)

5. AS (Acrylonitrile Styrene) & PS (Polystyrene)

AS:

- Clarity comparable to PC

- Good chemical resistancehttp://www.umbottle.com/ProductsDetail-VB-10332.html

- Used for measurement scale windows

PS:

- Low cost but brittle

- Only suitable for disposable cup lids

Critical Parameters:

- AS requires mold temperature >80°C to ensure clarityhttp://www.umbottle.com/ProductsDetail-VB-10332.html

- PS needs fast filling to prevent silver streaks

Would you like me to elaborate on any specific technical aspects?